A Commonwealth War Graves Commission Cemetery in northern France.Commonwealth War Graves Commission Cemeteries are as much memorial gardens as they are cemeteries. The original blueprints included the distinctive, but simple common headstone design, which were to be set into a carefully thought out selection and arrangement of flowering plants. Since 1918 the Commission has looked after 708ha of land throughout the world, and the significance of flowers was recognised from the beginning.
Initially it was hoped that plants indigenous to the countries of the fallen would be used, in order to enhance the connection between the deceased's place of rest and his place of origin. In practice this turned out not always to be possible, and so far as I can tell (having checked the list provided on the excellent CWGC website) no Australian plants are used in Europe. Nevertheless, plants are carefully chosen to soften the rows of headstones and provide a rain splash filter but not obscure the inscriptions. In addition, the Commission wanted visitors to feel at ease and that they were in a place of beauty and peace, rather than somewhere eerie and frightening. In France, the graves and gardens are set in lawn, emphasising the garden atmosphere.
You can read more about the Commission's approach to gardening in the cemeteries on their website.